Class: ActiveRecord::Migration::Current

Do not use. This class is for internal use only.

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses: Schema, ActiveRecord::Migration::Compatibility::V4_2, ActiveRecord::Migration::Compatibility::V5_0, ActiveRecord::Migration::Compatibility::V5_1, ActiveRecord::Migration::Compatibility::V5_2, ActiveRecord::Migration::Compatibility::V6_0, ActiveRecord::Migration::Compatibility::V6_1, ActiveRecord::Migration::Compatibility::V7_0, ActiveRecord::Migration::Compatibility::V7_1, ActiveRecord::Migration::Compatibility::V7_2, ActiveRecord::Migration::Compatibility::V8_0, ActiveRecord::Migration::Compatibility::V8_1
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, Migration
Instance Chain: self, Migration
Inherits:	Migration `::Object` Migration ActiveRecord::Migration::Current
Defined in:	activerecord/lib/active_record/migration.rb

Overview

This must be defined before the inherited hook, below

Instance Method Summary

#change_table(table_name, **options)
#compatible_table_definition(t)

Ancestors are walked oldest-version-first, so the newest version's module ends up first in method lookup — the same order the per-class overrides produced.
#create_join_table(table_1, table_2, **options)
#create_table(table_name, **options)
#drop_table(*table_names, **options)

Instance Method Details

#change_table(table_name, **options)

[ GitHub ]

# File 'activerecord/lib/active_record/migration.rb', line 587


def change_table(table_name, **options)
  if block_given?
    super { |t| yield compatible_table_definition(t) }
  else
    super
  end
end

#compatible_table_definition(t)

Ancestors are walked oldest-version-first, so the newest version's module ends up first in method lookup — the same order the per-class overrides produced.

[ GitHub ]

# File 'activerecord/lib/active_record/migration.rb', line 614


def compatible_table_definition(t)
  (self.class.ancestors & Compatibility.version_classes).each do |version_class|
    next unless version_class.const_defined?(:TableDefinition, false)
    t.singleton_class.prepend(version_class.const_get(:TableDefinition, false))
  end
  t
end

#create_join_table(table_1, table_2, **options)

[ GitHub ]

# File 'activerecord/lib/active_record/migration.rb', line 595


def create_join_table(table_1, table_2, **options)
  if block_given?
    super { |t| yield compatible_table_definition(t) }
  else
    super
  end
end

#create_table(table_name, **options)

[ GitHub ]

# File 'activerecord/lib/active_record/migration.rb', line 579


def create_table(table_name, **options)
  if block_given?
    super { |t| yield compatible_table_definition(t) }
  else
    super
  end
end

#drop_table(*table_names, **options)

[ GitHub ]

# File 'activerecord/lib/active_record/migration.rb', line 603


def drop_table(*table_names, **options)
  if block_given?
    super { |t| yield compatible_table_definition(t) }
  else
    super
  end
end